Harris Indoor Fogger release a room fog to kill roaches, fleas, ticks, mosquitos, spiders & many more listed insects. Featuring a long residual that continues to kill German cockroaches for up to 12 weeks. Reaches deep into cracks and crevices to kill bugs you don't see. 3 Pack of foggers are effective in treating a large area to combat a large infestation. 2,000 Cubic Feet of Treatment Per Fogger - Each fogger will treat a room of 10' x 25' with 8 foot ceiling. Must follow label directions carefully. Not for small enclosed spaces.